[AMLUtils] Recognize Meson8 baby platform (S805)
[AMLUtils] Change some more permissions

In current Android 4.4.2 sources we need to change
permissions to 666 for following:

    /dev/amvideo
    /dev/amstream_sub
    /dev/amstream_sub_read
    /dev/amstream_rm
    /dev/amstream_mpps
    /dev/amstream_mpts
    /dev/amstream_abuf
    /dev/amstream_vbuf
[AMLUtils] Check for xbmc.no_need_su build.prop property before requesting SU
[AMLUtils] Change min/max freq and scaling governor node permissions only if Amlogic M6